EP0659060A1 - Clip for surgical use and clip applicator. - Google Patents
Clip for surgical use and clip applicator.Info
- Publication number
- EP0659060A1 EP0659060A1 EP93915967A EP93915967A EP0659060A1 EP 0659060 A1 EP0659060 A1 EP 0659060A1 EP 93915967 A EP93915967 A EP 93915967A EP 93915967 A EP93915967 A EP 93915967A EP 0659060 A1 EP0659060 A1 EP 0659060A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clip
- pin
- flexible bridge
- applicator
- gripper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/064—Surgical staples, i.e. penetrating the tissue
- A61B17/0644—Surgical staples, i.e. penetrating the tissue penetrating the tissue, deformable to closed position
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/122—Clamps or clips, e.g. for the umbilical cord
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/128—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord for applying or removing clamps or clips
- A61B17/1285—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord for applying or removing clamps or clips for minimally invasive surgery
Definitions
- Clip for use in surgery and clip applicator
- the invention relates to a clip for use in surgery according to the preamble of the first claim and a clip applicator for setting the clip.
- a clip of the type mentioned is known from US 4,498,476.
- This clip which is used to clamp blood vessels, consists of an upper clip part and a lower clip part, which are connected to each other symmetrically by a flexible bridge part.
- the upper clip part contains an opening into which a pin attached to the lower clip part engages.
- the pin carries a roof-like projecting or arrow-shaped tip. The pin and possibly the tip, together with the opening, act as locking elements for closing the clip. When closed, the upper part of the clip and the lower part of the clip touch. With this clip, tissue edges cannot be approximated and fixed.
- a surgical clamp in particular a blood vessel clamp, which likewise consists of an upper part and a lower part, the upper and lower part being connected symmetrically to one another by a flexible bridge part.
- the upper part contains an opening into which a ratchet can engage.
- the ratchet has teeth on one side, with the help of which the clamp can be closed and locked. Even with this clamp, tissue edges cannot be approximated and fixed.
- German utility model G 83 29 725 describes a microclip for medical purposes made of elastically deformable material, which is made of a U-shaped part and attached to the free one Legs of the U attached and ending approximately parallel to the legs of the U, there are essentially straight sections and are characterized in that the straight sections run at a short distance from the legs of the U and these only in the vicinity of the connection touch with the free legs of the U.
- the microclip is preferably made of soft-elastic stainless steel.
- the free ends of the U can contain openings at which a clip applicator can be attached.
- the known microclip is also mainly intended for clamping blood vessels; it seems less suitable for fixing tissue edges after incisions.
- microclip Another surgical microclip is described in EP 0 432 743 AI.
- This microclip has two flanges made of sheet metal lying opposite one another. On the flanges there are points directed towards one another at one end and grip areas which can be compressed against spring force at the other end.
- the microclip is formed in one piece and has a connecting flange which extends between the grip areas and is designed to be resiliently elastic.
- microclip since it is obviously set by hand, must be relatively large and is therefore not suitable for internal surgery and in particular not for minimally invasive surgery (MIC).
- an aneurysm clip which has two pivotally connected, crossing legs, with the aid of which tissue can be fixed.
- the legs are pressed together with the aid of a double turn of a spring wire which is connected to the two legs.
- the two clips described last are particularly suitable for the temporary clamping of blood vessels; they are not suitable for permanent fixation of tissue edges after incisions.
- a tube ligature gun is known with which clips can be used to interrupt vessels.
- the device is suitable for clips whose upper and lower parts can be folded against each other via an axis and which can be fixed by a spring.
- a clip application pliers is known from DE 40 24 636 AI. These clip-on pliers have a tube that can be moved in the axial direction with the aid of two handle halves. At the distal end of the tube two claws protrude, which can be opened and closed via a rope that is guided in the tube.
- the tube consists of a tubular elastic sheathing which remains stable in position when the rope is moved.
- the clip application forceps are obviously used to apply aneurysm clips.
- the invention is based on the object of proposing a clip of the type mentioned at the outset and a clip applicator suitable for setting this clip, with the aid of which in mini-invasive surgery (MIC) through a trocar sleeve tissue edges can be approximated and fixed after lesions or incisions.
- MIC mini-invasive surgery
- Figure 1 shows a clip according to the invention in side view and in plan view after placing in (not shown) tissue.
- FIG. 3 shows the distal end of the applicator with an inserted clip in the initial form in a side view
- FIG. 5 shows the distal end of the applicator with a partially opened, ready-to-use clip in a side view
- FIG. 8 shows the distal end of the applicator and the deformed clip that is secured against opening after approximation and fixation of tissue (not shown).
- the clip according to the invention is shown in its final form set in the tissue in FIG. 1. It consists of a clip lower part 1 and a clip upper part 2, which are connected to one another by a flexible bridge part 8.
- the clip can consist of a bendable material, such as a suitable stainless steel wire with a uniform diameter.
- the bridge part is deformed by an appropriately designed applicator, while the lower part of the clip and the upper part of the clip remain unformed.
- the cross section of the bridge part 8 is preferably reduced compared to the cross sections of the other parts of the clip. It is hereby achieved that the pin 9 can exert a high force on the tissue when the clip is set without bending, while the effort required for bending the bridge part remains within limits.
- the clip according to the invention has a plane of symmetry. At its free end, the clip part 1 carries a pin 9 angled in the plane of symmetry, which ends in a tip 10.
- the upper part of the clip 2 has a rounded protector nose 12 at its free end. In the vicinity of the protector nose 12, the upper clip part 2 is provided with an opening 11 which is arranged in the plane of symmetry.
- the lengths of the lower clip part 1 with the pin 9, the flexible bridge part 8 and the upper clip part 2 up to the opening 11 are dimensioned such that the pin 9 engages with the tip 10 in the opening 11 when the upper clip part 2 deforms the bridge part 8 is pressed against the clip base 1.
- the tissue to be approximated and fixed is pierced and charged. Then the upper clip part 2 is pressed by bending the bridge part 8 so far against the pin 9 of the lower clip part 1 until the tip 10 engages through the opening 11.
- the cross section of the pen tip 10 and the cross section of the opening are selected accordingly.
- the simplest solution is ne circular opening 11 and a conical or pyramidal tip 10.
- the protector nose 12 is preferably bent in the same direction as the pin 9. This makes it possible to secure the clip against unintentional opening and at the same time to keep the pin tip 10 in such a way that further injuries to the fixed tissue are excluded.
- the pin tip 10 protruding from the opening 11 is bent over in the direction of the protector nose 12, so that it is protected by the bent protector nose 12.
- bridge part 8 of the clip has a smaller cross section and offset surfaces 6, 7 in the clip upper part 2 and clip lower part 1 are provided at the interface between these clip parts and the bridge part 8. It is also advantageous if a pin 3 is formed on both sides in the area of the clip upper part 2 adjacent to the bridge part 8, perpendicular to the plane of symmetry. Pins with a bevel 4 on the side facing away from the bridge part 8 are particularly preferred.
- the clip according to the invention can be punched out of sheet metal and then bent into the initial shape shown in FIG. 3. It consists of a single part, so that it is not necessary to assemble small individual parts. With appropriate material choice, e.g. B. a flexible stainless steel, the bridge part can be deformed several times without breaking.
- the clip can be made so small that it can be placed with one of the common 5, 7 or 10 mm trocar sleeves.
- FIGS. 3 and 6 The construction of the clip applicator adapted to the clip according to the invention can best be seen from FIGS. 3 and 6.
- the following characteristics are essential: a) a clip gripper for gripping and holding the bendable bridge part 8 of the clip; b) an applicator shaft tube 39, which can be displaced axially and perpendicularly to the fixed flexible bridge part 8 of the clip via an actuating handle 13, 14 and whose head 38 deforms the clip in the region of the flexible bridge part 8 in the region of the flexible bridge part 8 in such a way that the lower clip part 1 and the upper clip part 2 assume an approximately parallel position; c) two opening pins 47 in the applicator head 38 and a stop rod 28 in the clip gripper 27, with the aid of which, when the applicator shaft tube 39 is moved in a practical manner, the clip upper part 2 is deformed into an approximately vertical position by deforming the flexible bridge part 8 Clip lower part 1 can be brought.
- FIGS. 2 to 8 The embodiment of the clip applicator shown in FIGS. 2 to 8 is designed for one-hand operation. It allows the clip to be introduced in the form shown in FIG. 4 by means of a trocar sleeve of 5, 7 or 10 mm which is adapted to the applicator head 38 and the applicator shaft 21.
- the clip is held in the form shown in FIG. 4 and is inserted through the trocar sleeve into which in FIG. 4 a simple translatory movement of the shaft outer part consisting of the parts 22, 38 and 39 relative to the shaft inner part 23 and the gripper 27 leads.
- the closing and opening of the clip takes place with deformation of the hinge bow 48 (FIG.
- the clip When opening and closing, the clip translates approximately between the position shown in FIG. 5 and the beginning of the post-forming ribs 40 and 41 in the applicator head 38 (see FIG. 3).
- the construction of the applicator head 38 and the gripper 27 shown means that the radius of the hinge bow 48 remains relatively large in this working area and that its plastic deformations lead to material failure only after an unrealistically large number of working cycles.
- the clip After gripping and pulling into the applicator head according to FIG. 3, the clip is securely held and / or guided by contacting the following clamping or sliding surfaces:
- the clip gripper 27 and thus also the gripped clip can be ergonomically and safely directed by the operator's hand via the inner shaft part 23 and the palm grip part 14.
- the closing and opening of the clip in the operating position by moving the applicator head 38 and the shaft tube 39 when the finger grip part 13 is actuated does not lead to the clip being dislocated, which would always have to be compensated for by a corrective hand movement by the surgeon.
- the program sequence when executing the system functions listed above and the paths required for the applicator head 38 relative to the clip gripper 27 are determined by the cooling tracks 17 in the drive head 16 in conjunction with an in they engaging tongue predetermined on the spring lever 20, which is pivotally mounted in the handle head 15 and which is moved against the pressure of the flat spring 50 to change the slide tracks with the thumb in the direction of the handle 15.
- This program mechanics defines three work areas:
- the applicator head 38 is moved relative to the gripper 27 by actuating the finger grip part 13 from the position shown in FIG. 6 to the position shown in FIG.
- the finger grip part 13 is then blocked against distal resetting into the starting position by the flat springs 52.
- the applicator head 38 can be moved back and forth relative to the gripper 27 between two attachment points defined by the slide track.
- the clip for loading tissue edges is opened (FIG. 5) and closed (FIG. 4). Unintentional release or locking of the clip is not possible.
- the spring lever 20 After loading both fabric edges onto the pin 9 of the clip, the spring lever 20 is actuated by thumb as described above. As a result, the tongue on the spring lever 20 jumps into the lower-lying second part of the sliding track 17. Due to the further now possible tightening of the finger grip part 13, the hinge arch 48 is reshaped under the reforming ribs 40 and 41, and the clip upper part 2 is placed lower (Fig. 7 and 8), the pen tip 10 is bent onto the protector nose 12 and the clip is thereby locked (Fig. 8). When the handle part 13 is relieved, the action of the flat springs 52 retracts the applicator head 38 towards the proximal end and releases the clip with the fixed tissue edges.
- the applicator shaft 21 including the applicator head 38, clip gripper 27 and drive head 16 can be exchanged with the link tracks 17. It is advantageous due to the design that the applicator and drive heads are changed at the same time and the slide tracks 17 are therefore always optimally adapted to the respective clip dimensions.
- the system proposed here also consists of the clip and the associated applicator.
- the operating handle selected here allows applicators with 5 mm, 7 mm and 10 mm shaft outer diameter to be driven in suitable trocar sleeves.
- the instrument shafts 21 are changed by operating the two knurled screws 18 and 24 in the drive head 16 or handle head 15.
- the applicator consists of three modules:
- the applicator head 38 with the mouth 26, the guide grooves 42, 43 and 51, the post-forming ribs 40 and 41 and the opening pin 47 is used in conjunction with the clip gripper 27 for receiving and shaping the clip.
- the handle essentially consists of the palm grip part 14, the finger grip part 13 articulated to it via the pin 25, the flat springs 52 for returning the grip, the grip head 15 with the pivotable spring lever 20 and the flat spring 50 to it Provision.
- the handle is designed for one-handed operation. It allows the instrument to be held and guided, the applicator head 38 to be driven and the spring lever 20 to be operated by the operator's thumb when the application program is being processed.
- the applicator shaft 21 with the shaft tube 39, the transition piece 22, the drive head 16 connected to the transition piece and the shaft inner part 23 is the connection between the applicator head 38 or clip gripper 27 and the handle in a constructively selectable length.
- the drive head 16 contains two slotted grooves 17 which, in cooperation with a tongue on the spring lever 20, enable the application program to be processed reliably.
- the side-by-side link grooves 17 guide the tongue of the spring lever 20 on three different levels A, B and C when the applicator handle is operated, which are offset in height by the step s.
- the open clip as shown in FIG. 3 is taken over directly from a suitably shaped magazine or from tweezers by the clip gripper 27.
- the clip gripper 27 In the proximal dead center position of the applicator head 38, as shown in FIG. 6, the clip gripper 27 is fully open.
- the clear distance between the gripper jaws 32 and the gripper heads 29 is maximum in this position and is predetermined by the flat springs 31 which are bent outwards in this relaxed state.
- the applicator head 38 can be moved distally.
- the clip gripper 27 is closed in accordance with the distance traveled by the applicator head 38 relative to the gripper heads 29.
- the clip is positioned exactly relative to the gripper heads 29 such that the bridge part 8 lies exactly between the proximal surfaces of the gripper jaws 32 and the distal end of the stop rod 28 .
- the position of the clip in the gripper heads 29 both by guiding the offset surfaces 7 of the lower clip part 1 on the index surfaces 34 of the gripper heads 29 and by guiding the offset surfaces 6 of the clip upper part 2 on the index surfaces 33 is fixed.
- the gripper jaws 32 can be closed, as described, by advancing the applicator head 38 in a distal direction.
- the section of the clip upper part 2 slides between the pin back 5 and the offset surfaces 6 and part of the not yet formed hinge bow 48 of the bridge part 8 through the clear gap between the opener pin 47 in the applicator head 38. A sufficient distance is structurally ensured between the pin back 5 of the still stretched upper clip part 2 and the top surfaces 45 of the opening pin 47.
- the guide ribs 30 on the gripper heads 29 also track into the guide groove 51 and now secure the gripper 27 against gaping under load by supporting the gripper heads 29 on the walls of the groove 51.
- the guide ribs 30 slide past the opener pin 47 in the applicator head.
- the gripper heads 29 with the lower clip part 1 are drawn into the lower guide groove 42 of the applicator head 38.
- the clip shape as shown in FIG. 3, remains unchanged until the clip upper part 2 touches the stop and shaping rib 44 in the applicator head 38.
- the flexible bridge 8 is deformed in the area of the hinge arch 48 between the stop and shaping rib 44 and the gripper jaws 32 in such a way that the upper clip part 2 begins a closing movement in the direction of the lower clip part 1.
- the clip then has approximately the shape shown in Fig. 5.
- the upper clip part 2 is still on the stop and forming rib 44th
- the tongue on the spring lever 20 was first raised on an increasing surface of the first link path 17a against the spring force of its own shaft from the starting plane A by 2 s to the level B.
- Fig. 3 shows the corresponding clip position in the applicator head.
- the finger part 13 is secured against being reset to the starting position by blocking the drive head 16. Unintentional release of the clip is excluded.
- the closing movement of the clip initiated towards the end of the loading process is continued.
- the clip slides further into the guide grooves 42 and 51 a.
- the bridge 8 on the upper clip part 2 is formed by the pair of forces between the gripper jaws 32 and the stop and shaping rib 44 to form the hinge arch 48.
- the pins 3 projecting laterally from the clip upper part 2 pass through the gap between the opening pins 47 and the stop and deformation rib 44 into the guide groove 51, on the side surfaces of which they slide and thereby support the clip upper part 2 laterally.
- An additional lateral guidance of the upper clip part 2 is provided in the course of the closing process by being immersed between the opening pins 47 in the applicator head 38 (FIG. 4).
- the distal feed path of the applicator head 38 relative to the clip gripper 27 is limited by the stop of the spring lever tongue at the proximal end of the first link path 17 on the plane C in the drive head 16. An unintentional locking of the clip when driving under the post-forming ribs 40 and 41 is thus ruled out. As long as the applicator head 38 is moved relative to the clip gripper 27 in an area which is limited by the distal and proximal stop on the plane C of the first cooling track 17, the clip remains secured against unintentional release and locking.
- the clip must be opened in the surgical field to grip and load the first tissue edge.
- the finger grip part 13 is relieved and moved back between the grip parts by the appropriately dimensioned flat springs 52.
- the applicator head 38 is thereby displaced proximally. If the surfaces of the bevel 4 on the pins 3 of the clip upper part 2 and the surfaces 46 on the opener pins 47 touch, a force component is generated by the shear force acting parallel to the applicator axis on the pins 3 on the clip upper part 2, which force the clip , as shown in FIG. 5, by partially stretching the hinge bow 48.
- the tip 10 of the pin 9 on the lower clip part 1 is placed near the edge of the incision on the outer surface (the surface which would point to the applicator without incision) and an attempt is made to pierce the tissue by axially moving the pin.
- This experiment is supported by careful longitudinal movement of the applicator proximally. This creates an additional force component in the direction of the pin axis on the pin tip 10 inclined toward the clip bridge.
- the applicator head 38 is moved distally relative to the clip gripper 27 by tightening the finger grip part 13, and the clip is closed as described above.
- the tissue cross section lying between the pen tip 10 and the opening 11 in the clip upper part 2 is more easily pierced because of the minimized elastic deflection and because of the counterforce of the upper part, and the tissue edge is loaded onto the tip.
- the fabric edge lying in the clear cross section of the clip wanders into the mouth 26 of the applicator head 38 when the clip is closed.
- the outer side of the hinge bow 48 lies close to the contact surfaces 49 of the post-forming ribs 40 and 41.
- the spring lever 20 is pressed against the resistance of the flat spring 50 towards the handle head 15 with the thumb of the hand holding the handle when the clip is closed according to FIG.
- the tongue of the spring lever 20 falls back to level A in the second slide track 17 by s. After this brief one-time pressure on the spring lever 20, the tongue is caught in the slide track 17. It slides along the step between the grooves 17 and thereby prevents the spring lever 20 from being reset before the clip is released.
- the hinge bow 48 of the clip first touches the oblique contact surfaces 49 of the post-forming ribs 40 and 41.
- the distal end of the clip upper part 2 moves further in the direction of the clip lower part 1, deforming the hinge bow 48, until the tere edge of the opening 11 is placed on the oblique edges of the pen tip 10.
- the hinge arch 48 is pressed under the post-forming ribs 40 and 41, thereby bringing the clip upper part 2 into the shape shown in FIG.
- the pin tip 10 on the stop and shaping rib 44 is also bent and slides into the guide groove 51.
- the protector nose 12 on the clip upper part 2 is bent more or less straight depending on the thickness and elastic counterforce of the tissue in the clip.
- the restoring forces of the protector nose 12 after the deformation ensure, by supporting the edge of the hole in the clip upper part 2 on the edges of the pin tip 10, that the tip rests on the protector nose and thus the bearing tissue of the clip against injury.
- the upper part of the clip 2 has been moved further to the axis of the applicator mouth 26 by the reshaping and closing operation from the bottom of the guide groove 51, in which the opening and closing of the clip was realized by translational sliding (FIG. 8). .
- the pins 3 on the upper clip part 2 now lie, as shown in FIG. 8, in a plane below the opener pins 47. If the applicator head 38 is moved back proximally pulled, the pins 3 slide on the clip upper part 2 under the opening pin 47.
- the flat springs 31 open the gripper heads 29 comprising the clip bridge 8, and the gripper jaws 32 release the clip shaped in accordance with FIG. 1 with the enclosed tissue edges.
- the tongue of the spring lever 20 jumps back at level A from the second slide track 17 into the first slide track 17 due to the pressure of the flat fields 50.
- the spring lever 20 is thus again in the starting position.
- the applicator can be removed with the above gripper 27 through the trocar sleeve from the surgical site and immediately loaded with the next clip.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Reproductive Health (AREA)
- Vascular Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4230102 | 1992-09-09 | ||
DE4230102A DE4230102C2 (en) | 1992-09-09 | 1992-09-09 | Clip for use in surgery and clip applicator |
PCT/EP1993/001929 WO1994005219A1 (en) | 1992-09-09 | 1993-07-21 | Clip for surgical use and clip applicator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0659060A1 true EP0659060A1 (en) | 1995-06-28 |
EP0659060B1 EP0659060B1 (en) | 1997-01-15 |
Family
ID=6467571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93915967A Expired - Lifetime EP0659060B1 (en) | 1992-09-09 | 1993-07-21 | Clip for surgical use and clip applicator |
Country Status (6)
Country | Link |
---|---|
US (1) | US5522823A (en) |
EP (1) | EP0659060B1 (en) |
JP (1) | JP2589058B2 (en) |
AT (1) | ATE147611T1 (en) |
DE (1) | DE4230102C2 (en) |
WO (1) | WO1994005219A1 (en) |
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US10028745B2 (en) | 2011-03-30 | 2018-07-24 | Noha, Llc | Advanced endovascular clip and method of using same |
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-
1992
- 1992-09-09 DE DE4230102A patent/DE4230102C2/en not_active Expired - Fee Related
-
1993
- 1993-07-21 EP EP93915967A patent/EP0659060B1/en not_active Expired - Lifetime
- 1993-07-21 WO PCT/EP1993/001929 patent/WO1994005219A1/en active IP Right Grant
- 1993-07-21 AT AT93915967T patent/ATE147611T1/en not_active IP Right Cessation
- 1993-07-21 JP JP6506779A patent/JP2589058B2/en not_active Expired - Lifetime
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1994
- 1994-12-09 US US08/352,904 patent/US5522823A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO9405219A1 * |
Also Published As
Publication number | Publication date |
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DE4230102A1 (en) | 1994-03-10 |
ATE147611T1 (en) | 1997-02-15 |
US5522823A (en) | 1996-06-04 |
JP2589058B2 (en) | 1997-03-12 |
EP0659060B1 (en) | 1997-01-15 |
JPH08502671A (en) | 1996-03-26 |
WO1994005219A1 (en) | 1994-03-17 |
DE4230102C2 (en) | 1994-08-04 |
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